Hui guys. I'm new to Mac. My new iMac is rebooting many times a day.With the help from Apple, I've cheked hardware, ram. Everything seems do to be ok. Any ideas ?
Thanks a lot for any help.
Backups created prior to uninstalling Avast should not be relied upon, so I suggest you create an entirely new backup.
Time Capsule is fine. It is no more or less reliable than anything else.
Augmenting your backup strategy with the use of additional devices as you suggest is always a good idea though. Using additional methods such as a "clone" is also a good idea. Such redundancy ensures the risk of permanent data loss is reduced to an acceptable degree.