Selfhosted
A place to share alternatives to popular online services that can be self-hosted without giving up privacy or locking you into a service you don't control.
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Definitely upgrade the RAM. Also get at least two drives in RAID or ZFS or something so you can tolerate a failure. And keep backups too, if you can't afford to lose data.
Why do you think OP needs high availability?
In case of disk failure, simply redeploy and restore backups. Having an automated and fast redeployment procedure (and working backups) is a must-have, disk fault tolerance is not, IMHO (unless you have specific requirements).
I don't think OP has backups.
Having one, the other, or both depends on how sure you need to be about recovery, and whether you care about it being available until recovery.