Consider this…you are traveling to India and you lose or ruin your passport, credit cards or other travel essentials like medical prescription, emergency contact numbers, travel tickets, etc. Trust me my traveler friends that if you are not prepared for this scenario then it can be your nightmare.
Sure you must be vigilant in protecting your documents in the first place but a simple step of making photocopies of the documents ahead of time and having accesss to them if needed will be of immense help to you.
For this, you can either carry these copies with you or place the copies with your trusted people or keep an online-backup of them.
Security is cetainly an issue with the option of backing-up these documents online like emailing the images of these documents to yourself and, so, do some research to find out who offers a more secured solution.
One thing you can do about online backup of these documents is to make a password protect zip file of the images and then email them to your account.