I use offlineimap to sync several email accounts both to local storage, and to accounts on other free email providers. E.g., a gmail account dedicated to bug reporting is replicated by offlineimap to an outlook.com account.
Address books and calendars for random gmail accounts get synced by vdirsyncer to both local storage and also to other backup gmail accounts.
It works well, and I don't have to worry about e.g., Google permanently locking me out of one of these accounts, without recourse.
* Both offlineimap and vdirsyncer are in Debian's repos. But, I had to pin/install vdirsyncer from testing to get working oath support for gmail (it did not pull in any dependencies from testing that were concerning [I don't recall if it pulled in anything at all, but I would not have installed from testing if it pulled in anything concerning]).
Comments
I use offlineimap to sync several email accounts both to local storage, and to accounts on other free email providers. E.g., a gmail account dedicated to bug reporting is replicated by offlineimap to an outlook.com account.
Address books and calendars for random gmail accounts get synced by vdirsyncer to both local storage and also to other backup gmail accounts.
It works well, and I don't have to worry about e.g., Google permanently locking me out of one of these accounts, without recourse.
* Both offlineimap and vdirsyncer are in Debian's repos. But, I had to pin/install vdirsyncer from testing to get working oath support for gmail (it did not pull in any dependencies from testing that were concerning [I don't recall if it pulled in anything at all, but I would not have installed from testing if it pulled in anything concerning]).