You can backup up to 15Gb of data for free to any of the Cloud services (eg) Google Drive, MS One Drive, iCloud, etc. Just drag and drop, copy and paste your personal files (eg) pictures, music, documents to the cloud service. You can also have more then one service. Or get yourself an external HDD or use both.
As for the computer problem, Does this happen on cold boot or waking from sleep? If happening on a cold boot, try a Clean Boot, if this works, try adding one startup item at a time until the computer doesn't boot, then you will know what the problematic program is.
As for the computer problem, Does this happen on cold boot or waking from sleep? If happening on a cold boot, try a Clean Boot, if this works, try adding one startup item at a time until the computer doesn't boot, then you will know what the problematic program is.