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ImapSync
Imapsync is an IMAP transfers tool. The purpose of imapsync is to migrate IMAP accounts or to backup IMAP accounts. IMAP is one of the three current standard protocols to access mailboxes, the two others are POP3 and HTTP with webmails, webmails are often tied to an IMAP server. Upstream website is
You can also find the 'GitHub version' (which I'd guess is where distributions get their versions from) at https://github.com/imapsync/imapsync . I used this for an uncomplicated transfer from one IMAP server to another; it felt pretty slow but with the right CLI flags it is interruptible/restartable, and I didn't end up with lost or duplicate mail.
It comes with the author's custom "no limits" licence (looks a lot like the WTFPL), so it probably qualifies as free & open source, but you don't get a support contract of course.
The author's site also has a "give me your IMAP credentials and I'll migrate your mailbox for you, free up to a size limit" service, https://imapsync.lamiral.info/X/ , which boggles the mind. On principle I couldn't trust it.
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If you do such a gmail backup, I wrote a cross platform Desktop app that can analyze these email backups to provide a visual clustering of the contents of your mails.
https://github.com/terhechte/postsack
It parses 500k mails in < 1 Minute, so it is quite fast. There's a web / wasm build of the UI here:
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WorkOS
The modern identity platform for B2B SaaS. The APIs are flexible and easy-to-use, supporting authentication, user identity, and complex enterprise features like SSO and SCIM provisioning.
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Backing up my gmail has been on my list for a while (as step 1 of a migration away from gmail). Does anyone haver any experience with this tool, and could compare it to offline-imap (https://github.com/OfflineIMAP/imapfw) or mbsync? For something important like email, I'd probably rather use something only with more battle testing. I guess beyond a backup I would hope to use the offline copy to migrate to a new provider.
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For gmail backup, I use https://github.com/gauteh/lieer which stores the result in a maildir with labels synchronised with notmuch.
It uses Google's API to fetch and send e-mails, and is quite performant.
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
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got-your-back
Discontinued Got Your Back (GYB) is a command line tool for backing up your Gmail messages to your computer using Gmail's API over HTTPS. [Moved to: https://github.com/GAM-team/got-your-back] (by jay0lee)
I suggest using https://github.com/jay0lee/got-your-back for gmail.
It works better because it can copy rules, labels, stars, etc.
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Did you do anything particular config-wise for accessing your local instance of dovecot? I tried with [0] but the connection times out when trying to connect via Thunderbird…
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I recently needed something like that, but didn't want to deal with perl or ruby, so I wrote
