I am also self-hosting using the excellent yunohost.org it allows me to painlessly maintain my email and nextcloud instance.
To solve the issue you mentioned (disaster recovery), I am using rsync.net borg service.
Another 'trick' I do which considerably help is to use my gandi.net free email accounts as secondary MX and relay for my emails:
- I bought my domain through gandi, I get 5 free emails account
- I put gandi mail as secondary mx and I mirror the important email account as gandi mail accounts. For example, if my email is [email protected], I create a gandi mail account for this address
- I run fetchmail on my server to fetch mails from gandi
- I setup a specific email account for relay (eg. [email protected]), and I configure my postfix to relay emails through gandi using this account
That way, if my server is unreachable, all emails are delivered to gandi and I can access them through gandi webmail. When everything works fine, most emails (99+% in my experience) go through the primary MX (my server). In case some are delivered to gandi or when my server is back up, fetchmail will just get them back locally.
This 'trick' helped me in numerous occasions, esp. when moving from a location to another, but it should also helped in case my house burns down.
The relay part alleviates most delivery issues: I used to have a lot of rejection (ISP MX rejecting residential IPs) or spam classification (gmail I hate you). I no longer does.
To solve the issue you mentioned (disaster recovery), I am using rsync.net borg service.
Another 'trick' I do which considerably help is to use my gandi.net free email accounts as secondary MX and relay for my emails: - I bought my domain through gandi, I get 5 free emails account - I put gandi mail as secondary mx and I mirror the important email account as gandi mail accounts. For example, if my email is [email protected], I create a gandi mail account for this address - I run fetchmail on my server to fetch mails from gandi - I setup a specific email account for relay (eg. [email protected]), and I configure my postfix to relay emails through gandi using this account
That way, if my server is unreachable, all emails are delivered to gandi and I can access them through gandi webmail. When everything works fine, most emails (99+% in my experience) go through the primary MX (my server). In case some are delivered to gandi or when my server is back up, fetchmail will just get them back locally.
This 'trick' helped me in numerous occasions, esp. when moving from a location to another, but it should also helped in case my house burns down.
The relay part alleviates most delivery issues: I used to have a lot of rejection (ISP MX rejecting residential IPs) or spam classification (gmail I hate you). I no longer does.