Evernote is perfect for me.

Do you recommend Glacier over Crashplan? I'm thinking about switching

They are very different.

Glacier takes hours just to get the listing of files, or start the file download.

Their pricing is very different. Crashplan charges per computer. Glacier charges per GB of storage and per GB of transfer out.

In what cases would be better to use Glacier? I don't have too many GB, ~30GB.

Glacier is for when you want to store essentially never-changing backups that you expect to very, very rarely access. You can store a couple GB or petabytes.

Think an archive of family videos and photos spanning 30 years, or all the tax documents for a large enterprise.

A 30GB backup, that's updated nightly, on AWS Glacier will cost somewhere in the neighborhood of $1 a month. A 300GB backup somewhere around $5 on AWS.

Glacier is cheaper for small backups that you almost never touch.