I would look into options for solving your CG/NAT (DDNS...) problems, since it's a first backup aswell. If your phone is stolen or lost, the captures from the last sync are already on your server.
Free and Open Source Software
If it's free and open source and it's also software, it can be discussed here. Subcommunity of Technology.
This community's icon was made by Aaron Schneider, under the CC-BY-NC-SA 4.0 license.
Bonus if there are any photo editing alternatives to Adobe stuff!
Try GIMP, I switched from PS with relative ease. I made graphic designs, though.
Affinity photo has a free trial and a buy once keep forever alternative for indesign, illustrator and photoshop. Gimp is none of those.
Ive been using Photopea recently to open up PSD files and I've been very impressed for an online, free (with ads), alternative
I like Photopea, although I feel bad... I should have clarified, I specifically meant mobile editing apps unfortunately! For the times when exposure is just a bit low.
I have the whole adobe suite for PC editing, since unfortunately too many of my projects just rely heavily on them. No creative cloud for me, though!