Question about backups

Hi everybody!

I am new to this forum and I got 2 questions about bitcoins and litecoins. Not sure if I made a 'big' mistake, or that I can still recover things. Would be nice if someone can help me, as I don't really know it anymore :/

Years ago (2013) I bought 2.7 litecoin and 0.2 bitcoin. Unfortunately I full recovered my computer and I deleted the programs.

Litecoin question
Concerning Litecoin. I only know my address, login and password. But unfortunately my litecoin.dat backup is only 0kB. So something went wrong with making a backup. Is there still a way of retrieving my account back?

Bitcoin question
For my bitcoins I made a 'full back-up' of multibit. I copied all the information in the root of the 'multibit' map:

- log
- mulitibit data
- mulitibit. checkpoints
- multibit-checkpoints
- multibit.info
- multibit
- multibit-spvchain
- multibit.wallet

Is there a way to recover this data or is it lost as well? Maybe I can open it with an old version of multibit (I think version multibit-05.15.) and copy paste the files? I am even not sure of my login details anymore, but I can probably guess them.

I should have made my backup better arround that time :/