So I gave Time Machine another try, with an external WD SSD drive. I selected encryption, for obvious reasons. The first run went well, encryption took a while but I thought OK, it has to encrypt the entire initial backup image of ~300GB. Later on I started another TM backup, which only consisted of a small number of files to be backed up incrementally.
Big surprise: after backup, it started to encrypt, and apparently it encrypted the ENTIRE SSD content again, which took a few hours!
Is there any way how to speed this up? If the only option is to always have TM encrypt an entire SSD, although only a few MB got backed up incrementally, this makes the entire system completely useless for me (unencrypted TM backups not being an option for me).
Big surprise: after backup, it started to encrypt, and apparently it encrypted the ENTIRE SSD content again, which took a few hours!
Is there any way how to speed this up? If the only option is to always have TM encrypt an entire SSD, although only a few MB got backed up incrementally, this makes the entire system completely useless for me (unencrypted TM backups not being an option for me).