What you are looking for cryptomatro is a good option though paid but if you want something with is not paid it is hard but you can try next cloud some instance provide a certain gb for free and what i prefer is just pay $3 like in your preferred cloud provided such as aws google cloud azure linone vulter digital ocean and so on just spin up a distro like ubuntu debian or cent os and install next cloud you can use other also in a same provider with containers… thanks
And if you have harddrive at home use syncthing
It is opensource just install a linux disto and use it for free.
Edit i forgot to mention
They have lifetime plans and very very low pricing with end to end encryption they have a free plan too but i like there service as a google drive alternative but it is new.i recommend try there lifetime plan it is worth it.i haven’t paid for but i might if i switch